package com.qf.traveller.customView;

import com.qf.traveller.R;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.ImageView;

public class RoundImageView extends ImageView {

	/** 图片的类型，圆形or圆角 */
	private int type;
	private static final int TYPE_CIRCLE = 0;
	private static final int TYPE_ROUND = 1;

	/** 圆角大小的默认值 */
	private static final int BODER_RADIUS_DEFAULT = 10;
	/** * 圆角的大小 */
	private int mBorderRadius;

	/** * 绘图的Paint */
	private Paint mBitmapPaint;
	/** * 圆角的半径 */
	private int mRadius;
	/** * 3x3 矩阵，主要用于缩小放大 */
	private Matrix mMatrix;
	/** * 渲染图像，使用图像为绘制图形着色 */
	private BitmapShader mBitmapShader;
	/** * view的宽度 */
	private int mWidth;
	private RectF mRoundRect;

	public RoundImageView(Context context, AttributeSet attrs) {
		super(context, attrs);
		mMatrix = new Matrix();
		mBitmapPaint = new Paint();
		mBitmapPaint.setAntiAlias(true);
		TypedArray a = context.obtainStyledAttributes(attrs,
				R.styleable.RoundImageView);
		mBorderRadius = a.getDimensionPixelSize(
				R.styleable.RoundImageView_borderRadius, (int) TypedValue
						.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
								BODER_RADIUS_DEFAULT, getResources()
										.getDisplayMetrics()));// 默认为10dp
		type = a.getInt(R.styleable.RoundImageView_type, TYPE_CIRCLE);// 默认为Circle
		a.recycle();
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
		if (type == TYPE_CIRCLE) {
			mWidth = Math.min(getMeasuredWidth(), getMeasuredHeight());
			mRadius = mWidth / 2;
			setMeasuredDimension(mWidth, mWidth);
		}

	}

	private void setUpShader() {
		Drawable drawable = getDrawable();
		if (drawable == null)
			return;
		Bitmap bmp = drawableToBitamp(drawable);
		// 将bmp作为着色器，就是在指定区域内绘制bmp
		mBitmapShader = new BitmapShader(bmp, TileMode.CLAMP, TileMode.CLAMP);
		float scale = 1.0f;
		if (type == TYPE_CIRCLE) {
			int bSize = Math.min(bmp.getWidth(), bmp.getHeight());
			scale = mWidth * 1.0f / bSize;

		} else if (type == TYPE_ROUND) {
			scale = Math.max(getWidth() * 1.0f / bmp.getWidth(), getHeight()
					* 1.0f / bmp.getHeight());
		}
		// shader的变换矩阵，我们这里主要用于放大或者缩小
		mMatrix.setScale(scale, scale);
		// 设置变换矩阵
		mBitmapShader.setLocalMatrix(mMatrix);
		// 设置shader
		mBitmapPaint.setShader(mBitmapShader);
	}

	private Bitmap drawableToBitamp(Drawable drawable) {
		if (drawable instanceof BitmapDrawable) {
			BitmapDrawable bd = (BitmapDrawable) drawable;
			return bd.getBitmap();
		}
		int w = drawable.getIntrinsicWidth();
		int h = drawable.getIntrinsicHeight();
		Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
		Canvas canvas = new Canvas(bitmap);
		drawable.setBounds(0, 0, w, h);
		drawable.draw(canvas);
		return bitmap;
	}

	@Override
	protected void onDraw(Canvas canvas) {
		if (getDrawable() == null)
			return;
		setUpShader();
		if (type == TYPE_ROUND) {
			canvas.drawRoundRect(mRoundRect, mBorderRadius, mBorderRadius,
					mBitmapPaint);
		} else {
			canvas.drawCircle(mRadius, mRadius, mRadius, mBitmapPaint);
		}
	}

	@Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		super.onSizeChanged(w, h, oldw, oldh);
		// 圆角图片的范围
		if (type == TYPE_ROUND)
			mRoundRect = new RectF(0, 0, getWidth(), getHeight());
	}
}
